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Xing Fan ⛳
ce4a709922
### Does this PR have any customer impact? No ### Type (Feature, Refactoring, Bugfix, DevOps, Testing, Perf, etc) Feature ### Does it involve schema level changes? (Table, Column, Index, UDF, etc level changes) UDF ### Are you introducing any new config? If yes, do you have tests with and without them being set? No ### Release Note (Refer [Template](../docs/release_notes/pgmongo_template.md)) ### Description Implemented covariancePop & covarianceSamp for setWindowFields ---- #### AI description (iteration 1) #### PR Classification Documentation #### PR Summary This pull request adds design documentation for the `$covariancePop` and `$covarianceSamp` aggregation operators. - Added `covariancePop.md` detailing the specification, behavior, examples, implementation plan, and test plan for the `$covariancePop` operator. - Added `covarianceSamp.md` detailing the specification, behavior, examples, implementation plan, and test plan for the `$covarianceSamp` operator.